Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c1ed86ddeafc33…

MALICIOUS

PDF

48.0 KB Created: 2021-09-28 18:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be1e743bf84825d881548fdae6d1cbba SHA-1: ba414628abf94d33d1bb3647c08d2bb895b779c7 SHA-256: 42c1ed86ddeafc3363e4474afc7beb67800678ac808924a6144e69432cf50cbc
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is the primary mechanism for executing malicious actions, such as redirecting users to the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=mayweather+vs+paul+free+stream
    • http://ginkgokatsudb.com/uploads/files/vufoxax.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/xopefibibirobumexu.pdf
    • http://connectcontrol.net/files/userfiles/files/zometibapa.pdf
    • http://sobateracota.ro/mm/file/35601923073.pdf
    • https://komunalno.vrgorac.hr/files/4736695373.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/99239257661.pdf
    • http://hilimall.ae/uploads/files/seniwaj.pdf
    • http://fsoa.cn/userfiles/file/94379760708.pdf
    • http://tbeaindia.com/userfiles/file/vaterewanetavalebuwupol.pdf
    • http://maezawa-jidousha.com/js/upload/files/vupawonixilojoxobol.pdf
    • http://daejonggyoyc.com/userfiles/file/20210919163124.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/42029124172.pdf
    • http://ahchala.com/img/file/danirataforajonudosoda.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/92cs61lkbapvc6guse6haghqc2/gekigake.pdf
    • http://lnianemarzenie.pl/userfiles/file/63478233321.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161327d8d5d8dd---14752538375.pdf
    • http://wittymall.com/multimedia/userfiles/file/pufuzilupuxomivetugi.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/99035112042.pdf
    • https://actaviaserica.org/board/file/files/18302093404.pdf
    • http://woykoff.hu/upload/file/gewuzipesabifo.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/16300854322.pdf
    • http://amongelite.com/ci/userfiles/files/91064590310.pdf
    • http://lagrupacio.cat/file/38645269048.pdf
    • http://talesma.com/E/file/xozunupebatufuta.pdf
    • http://sinproval.it/userfiles/files/vatujesumororivo.pdf

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